\documentclass[a4paper,12pt]{article}
\newcommand{\ds}{\displaystyle}
\usepackage{epsfig}
\begin{document}
\parindent=0pt

\begin{center}
\textbf{Partial Differentiation}

\textit{\textbf{Limits}}
\end{center}

\textbf{Question}

Evaluate the given limit. If the limit does not
exist, explain why.

$$ \lim_{(x,y)\to(0,0)} \sqrt{x^2+y^2}$$


\textbf{Answer}

$$ \lim_{(x,y)\to(0,0)} \sqrt{x^2+y^2}=0$$

\end{document}













